package io;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class CopyDemo2 {
    public static void main(String[] args) throws IOException {
        FileInputStream fis = new FileInputStream("123.jpg");
        FileOutputStream fos = new FileOutputStream("123_cp2.jpg");

        long start = System.currentTimeMillis();
        byte[] data = new byte[1024*10];
        int len; //记录每次实际读取的字节数
        while ((len=fis.read(data))!=-1){
            //将字节数组byte从下标0开始连续len个字节写出(做到多少就写多少)
            fos.write(data,0,len);
        }
        long end = System.currentTimeMillis();
        /*
        long start = System.currentTimeMillis();
        byte[] data = new byte[1024*10];

        while (fis.read(data)!=-1){
            fos.write(data);
        }
        long end = System.currentTimeMillis();
        */
        System.out.println("复制完毕!耗时:"+(end-start)+"ms");


        fis.close();
        fos.close();
    }
}
